JSON Formatter Tool – Beautify and Validate JSON with Custom IndentationJSON Formatter

Format, validate, and beautify your JSON data with 99tools.in's free JSON Formatter. Indent, minify, or pretty-print your JSON effortlessly online.

JSON Formatter

{{ isValidJson ? 'Valid JSON' : 'Invalid JSON' }}

Tool Features

  • Format (Beautify) JSON with indentation
  • Minify JSON to compact form
  • Detect invalid JSON syntax
  • Real-time validation and preview
  • Works directly in browser – no data saved

Welcome to 99tools.in’s JSON Formatter Tool — the fastest and easiest way to format, beautify, and validate your JSON data online. Whether you’re a developer, tester, or data analyst, this tool helps you instantly transform messy JSON strings into clean, readable, and properly indented formats.

What is a JSON Formatter?

JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used for APIs, configurations, and data storage. However, raw JSON can be hard to read without proper formatting.

Our JSON Formatter Tool takes your raw JSON and:

  • Organizes it with clear indentation
  • Adds line breaks for better readability
  • Validates JSON syntax to catch errors early
  • Allows you to customize indentation size and type for your coding preferences

Key Features of the JSON Formatter Tool

✅ Custom Indent Size: Choose how many spaces or tabs you want per indentation level for better readability or project standards.
✅ Indent Type Selection: Switch between spaces or tabs depending on your formatting needs.
✅ Syntax Validation: Instantly checks if your JSON is valid, highlighting errors for quick fixes.
✅ Minify Option: Compress your JSON by removing all unnecessary whitespace for optimized performance.
✅ Copy & Download: Easily copy the formatted JSON or download it as a .json file.
✅ User-Friendly Interface: Clean, intuitive design optimized for desktop and mobile use.

Why Use Our JSON Formatter?

  • 📈 Improve Code Readability: Clean and well-indented JSON is easier to debug and maintain.
  • ⚙️ Customizable Formatting: Adapt output to your team or personal coding style with flexible indent settings.
  • 🔍 Error Detection: Quickly identify malformed JSON to prevent bugs or crashes.
  • 🚀 Save Time: Format large JSON files instantly without installing software.

How to Use the JSON Formatter Tool

  1. Visit 99tools.in/json-formatter
  2. Paste your raw JSON code into the input box
  3. Select your preferred indent size (e.g., 2, 4 spaces) and indent type (spaces or tabs)
  4. Click “Format” or see your JSON beautified in real time
  5. Copy the formatted JSON or download it for your project

Who Should Use This Tool?

  • Developers and Programmers working with APIs or config files
  • QA Testers validating JSON responses
  • Data Analysts cleaning JSON datasets
  • Students and Learners practicing JSON formatting and validation

Final Thoughts

The JSON Formatter Tool from 99tools.in is your all-in-one solution for making JSON readable, clean, and error-free. With customizable indent size and type, it fits perfectly into any workflow — from casual formatting to professional development.

🔧 Try it now: Format Your JSON »